Counterparty Risk
Counterparty credit risk (CCR) is the risk that the other party to a derivative contract defaults before the final settlement of cash flows. Unlike straight loan credit risk, CCR is bilateral and stochastic because the mark-to-market value, and therefore the exposure, fluctuates with market prices. The risk is most severe in OTC markets and is mitigated through central clearing, initial and variation margin, netting agreements under an ISDA Master, and post-GFC regulatory reforms.
Try it yourself
Your loss when a counterparty defaults is the replacement cost of the trade (the positive mark-to-market), not the notional. Collateral and netting shrink it further.
On a derivative the other side can default any time the trade has positive value to you. You then have to replace the hedge at market, so your exposure is max(V, 0), a small fraction of the notional. Move the mark-to-market, the future-exposure add-on, and the collateral, and watch the exposure bar against the notional.
EAD = max( CE + add-on − collateral, 0 )
EAD = max( A$8.0m + A$2.0m − A$0.00m, 0 ) = A$10.0m
EL = PD · LGD · EAD = 2.00% · 60.0% · A$10.0m = A$0.12m
With a Credit Support Annex, posted collateral nets against the exposure. Without one, collateral does not apply and you are an unsecured creditor.
A US$100 million notional swap can produce a US$2 to US$5 million loss rather than a US$100 million loss. Why is the notional the wrong number for credit risk, and how do daily variation margin under a CSA and central clearing each push the exposure at default toward zero? When does the future-exposure add-on still matter even after today's mark-to-market is fully collateralised?
Assumption: a single-trade, single-period view in the Hull (2022) §24 spirit. EAD = max(CE + PFE add-on − collateral, 0), with the add-on a stylised percent of notional rather than a full simulated potential future exposure. PD and LGD are taken over one horizon.
Why it matters
Think of a 12-month forward contract on AUD/USD. The contract itself has no money changing hands at inception, but six months in, if the AUD has moved against your counterparty, they owe you a large mark-to-market amount. If they file for bankruptcy that day, you join the queue of unsecured creditors. The exposure is the positive replacement cost of the contract at default, not the notional amount. That is why a USD 100 million notional swap can produce a USD 5 million loss rather than a USD 100 million loss.
Counterparty credit risk on a derivative is highest in which setting?
Formulas
Worked examples
Bank A enters a 5-year interest rate swap with Bank B on a notional of A$200 million. Bank A pays fixed at 4% and receives BBSW. After two years, rates have fallen and the swap has a positive mark-to-market value of A$8 million to Bank A. Bank B then defaults.
Bank A's exposure is the A$8 million replacement cost, not the A$200 million notional. To restore its hedge, Bank A must enter a new swap with another dealer at current market rates, and the A$8 million represents the present value of the cash flows lost. If a Credit Support Annex (CSA) required Bank B to post collateral equal to the mark-to-market, the loss would be close to zero. Without collateral, Bank A becomes an unsecured creditor in the bankruptcy estate.
Lehman Brothers, September 2008. On 15 September 2008 Lehman filed for Chapter 11 with about US$639 billion in assets, the largest US bankruptcy at the time, against liabilities of about US$613 to 619 billion. Its OTC-derivatives book ran to hundreds of thousands of contracts (widely cited around 930,000) with tens of trillions of dollars of notional and several thousand counterparties. Counterparties faced the question of which trades had positive value to them and how to close out at fair prices in a stressed market.
Despite the enormous notional, each counterparty's actual loss was the replacement cost, the positive mark-to-market of its trades, a small fraction of notional rather than the notional itself. The failure still exposed weaknesses in bilateral OTC markets: opaque exposures, slow close-out, valuation disputes, and limited collateral. The disorderly unwind drove the G20 Pittsburgh Summit in September 2009 to mandate central clearing through CCPs and trade reporting for standardised OTC derivatives, transferring much CCR from bilateral counterparties to clearing houses. The teaching point is that counterparty exposure equals replacement cost, not notional, and central clearing exists to contain it.
Common mistakes
- ✗Counterparty risk only matters at maturity. It can crystallise any time the contract has positive value to the surviving party and the other side defaults. A 10-year swap exposes both parties for the full 10 years.
- ✗Counterparty exposure equals the notional amount. The loss equals the positive replacement cost , which is usually a small fraction of notional. A US$100 million swap may give rise to a US$2 to US$5 million loss.
- ✗Central clearing eliminates counterparty risk. It concentrates it at the CCP, which then manages it through margin, default funds, and waterfall procedures. A CCP failure would be systemic, which is why CCPs are now treated as critical financial market infrastructure.
Revision bullets
- •Risk the other side defaults before final settlement
- •Exposure , the positive mark-to-market
- •Highest in uncollateralised OTC derivatives
- •Mitigated by clearing, margin, netting, ISDA CSAs
- •G20 Pittsburgh 2009 mandated central clearing of standardised OTC
- •Lehman 2008 crystallised the need for reform
Quick check
Counterparty credit risk on a derivative is highest in which setting?
A bank holds an OTC swap with a notional of A$100 million and a current mark-to-market value of A$3 million in its favour. The counterparty defaults today. The bank's loss is closest to:
Connected topics
More in Foundations
In learning paths
Sources
- Hull, John C. Options, Futures, and Other Derivatives. 11th ed. Pearson, 2022. ISBN 978-0-13-693997-9.Chapter 24 covers credit risk, default probabilities, recovery rates, and credit value adjustment (CVA) for derivative portfolios.
- Bank for International Settlements, Financial Stability Board, IOSCO and Basel Committee. Incentives to centrally clear over-the-counter (OTC) derivatives. BIS, November 2018.Authoritative post-GFC review of how regulatory reforms shifted counterparty risk from bilateral OTC contracts to CCPs.
- World Federation of Exchanges. Reflections on Central Clearing: 15 Years after the Pittsburgh Summit. Focus, 2024.Retrospective on the G20 Pittsburgh commitments to clear standardised OTC derivatives and report trades to repositories.
- International Swaps and Derivatives Association. 2002 ISDA Master Agreement and Credit Support Annex documentation. ISDA.Industry-standard contract that governs OTC derivative trading, including close-out netting and collateral provisions that mitigate CCR.